Gas burner



Jan. 1.5., 1946. M11-1. KUHNER GAS BURNER Filed May 24, 1944 2 Sheets-Sheet 1 riz Euunawuoooaouooouoa/M/weoouao H, Kz/HER ,MAX

Jan. 15, 1946.

M. H. KUHNER v GAS BURNER Filed May 24,l 2 Sheets-sheet 2 MAJ: H. K HNER Patented Jan. 15, 1946 GAS BURNER Max H. Kuhner, Worcester, Mass., assigner to Riley Stoker Corporation, Worcester, Mass., a corporation of Massachusetts Application May 24, 1944, Serial No. 537,069

9 Claims.

This invention relates to gas burners, and more particularly to burners for use with gas of comparatively high caloric value, such as natural gas, and having provision for introducing the gas and the air for combustion into a furnace between spaced upright water wall tubes.

It is one object of the invention to provide a gas burner which will effect a comparatively thorough mixing of the gas and air as these elements enter the furnace, thereby promoting rapid and ecent combustion.

It is a further object of the invention to provide a gas burner which is capable of efficient operation at relatively high fuel burning rates.

It is a further object of the invention to provide a gas burner which is so constructed that it can safely be shut down while other burners are operating in the same furnace.

With these and other. objects in View, as will be apparent to those skilled in the art, the invention resides in the combination of parts set forth in the specification and covered by the claims appended hereto.

Referring to the drawings illustrating one embodiment of the invention, and in which like reference numerals indicate like parts:

Fig. 1 is a vertical section through a gas burner, the section being taken on the line I-I of Fig. 2;

Fig. 2 is a section on the line 2-2 of Fig. 1; and

Fig. 3 is an elevation of the burner from the furnace side thereof, on a reduced scale.

The embodiment illustrated comprises a furnace wall I which is protected on the furnace side by a row of spaced upright water wall tubes H. Water is circulated through these tubes in any suitable manner so that they may serve to generate steam by the absorption of radiant heat from the furnace. The wall I0 is provided with a rectangular opening I2 for the reception of a similarly shaped burner casing I4 which' extends forwardly from the wall and is preferably constructed largely of rolled metal sheets or plates suitably welded together. The portions of the water tubes II which extend across the opening I2 are arranged in groups, with two tubes in each group, so that the tubes are positioned with alternately close and wide spacing in a common plane, as best shown in Fig, 2. Preferably the tubes in each group are substantially in contact with each other. Inorder that this may be done while maintaining a substantially uniform spacing of the tubes over the remainder of the wallv I0, th'e required tubes may be formed with reverse bends I5 above and below the burner opening I2, as

shown in Fig. 3. 'I'he rear portion of the casing I4, which is located within the opening I2, is lined with comparatively thick cast plates l 6 of a suitable heat-resisting metal. Preferably this portion of the casing is offset outwardly by an amount equal to the thickness of the plates I6, so that the inner surfaces of the plates will be flush with the inner surfaces of the casing extending forwardly therefrom. The casing I4 is closed at the front by a vertical plate I1.

The interior of the casing I4 is divided by means of vertical longitudinally extending partitions I9 to provide a series of air passages 20 through which air may flow rearwardly and enter the furnace through the vertically elongated slots between the water tubes I I. As best shown in Fig. 2, each partition I9 is located in substantial alignment with one group of the water tubes I I, so that the partitions alternate with the slots between the tubes. The front portions of these partitions are formed of rolled metal sheets or plates with their top, bottom and front edges welded to the casing I4. The rear portions of the partitions are formed of comparatively thick cast plates 2l of a suitable heat resisting metal. Be-

tween the rear edges of the plates 2| and the water tubes I I there are provided rearwardly and laterally flaring deflectors 23 which form rearward extensions of the partitions I9. These'deiiectors are preferably made of a suitable heatresisting cast metal. Similar deiiectors 24 are provided between the rear edges of the side plates I6 and the adjacent water tubes, these deflectors 26 flaring toward the inner side only.

Air is supplied to the casing I4 at a suitable pressure from a duct 26 which is connected with the top of the casing in front of the wall I0. At the junction of this duct with the burner casing there is provided a damper ,frame 21 having a plurality of dampers 28 therein, there being a separate damper for each of the air passages 20. Each of these dampers can be adjusted independently of the others by means of a separate operating handle 30 which can be locked in a desired position by a screw 3|. Within each passage 20 there are mounted two downwardly and rearwardly curved guide vanes 32 which aid in distributing the air substantially uniformly throughout th'e height of the passage.

Within the rear portion of -each air passage 2D and immediately in front of the corresponding air discharge slot there is mounted a vertical gas pipe 3d provided with two vertical rows of openings 35 in its rear surface from which two rows of gas jets are discharged in rearwardly diverging directions through the slot. These pipes are mounted midway between the adjacent air deflectors 23- 24, and the 'openings 35 are so located that the gas jets will pass close to the adjacent water tubes Il without impinging thereon. Each pipe 34 is closed at its upper end and connected at its lower end to a horizontal pipe 36 which extends forwardly through a bracket 38 mounted on the front of the burner; The pipes 36 are slidable in the brackets 38, and can be held in desired positions by set screws 39. Gas of a rather high caloric value, such as natural gas, is supplied to the pipes 36 from a suitable source, an individualA valve 40 being provided for each pipe. A; small lighting and observation door 42 isprovided in into the furnace. Gas flows rearwardly through the pipes 36A under the control of the valves 40 andinto the vertical pipes 34, whence it escapes through the openings in `diverging jets as indicated in lig,` 2. The gas is supplied at a pressure. much higher than that of the air, and the gas jets accordingly penetrate the air stream effectively, promoting a thorough mixing of the gas and'air. This mixing is further aided by the fact that the gas jets are directed across the path of the air fow. Consequently the gas burns rapidly and eiciently. By proper adjustment of the dampers 28 and the valves 4D, the uelburning rate can be altered as desired, while maintaining the :correct ratio between the supplies of fuel and air. Any desired section of the burner can be shut down by closing the corresponding fuel valve and air damper, whereupon the pipe 3B is preferably-moved forwardly through the bracket 38 to bring the vertical jet pipe 34 forwardly so that it will be well protected by the tubes Il from the radiant heat of the furnace. In this same manner the entire burner cansafely be shut down while other burners are still operating in connece tion with the Vsame furn`ace. Y l

As many lsections may be provided i'n each kburner -as is desired, andthe height of the burner casing may be increased to provide a larger capacity. Since the burner utilizes the full area available between thewater tubes for the flow of air, it is well adapted for high` capacity operation. Having thus described my invention, what I .claim as new and desire to secure by Letters Patent is:V A y 1.k Incombination with a furnace wall having an opening therethrough, a. rowv of spaced upright water wall tubes adjacent the furnace side of the well, certain oi the tubes crossing the opening and being arranged to provide a plurality of vertically elongated slots between the tubes, means to deliver air rearwardly through the openingto the said slots and thence through the slots Vinto the furnace, an upright pipe located directly in front of each slot, and means to supply gas to the said pipes, each pipe having two vertical rows of openings in its rear surface arranged to discharge two rows of gas jets in rearwardly diverging directions.

2. In combination with a furnace wall having an opening therethrough, a row of spaced upright water wall tubes adjacent the furnace side of the wall, certain of the tubes crossing the opening .and being arranged in groups with twoclosely spaced tubes in each group, the groups being spaced apart to provide a plurality of vertically elongated slots, means to deliver air rearwardly through the opening to the said slots and thence through the slots into the furnace, an upright pipe located directly in front of each slot, and means to supply gas to the said pipes, each pipe having two vertical rows of openings in its rear surface arranged to discharge two rows of gas jets in rearwardly diverging directions.

3. In combination with a furnace wall having an opening therethrough, a row of spaced upright water wall tubes adjacent the furnace side of the wall, certain of the tubes crossing the opening'and being arranged in grourps with two closely spaced tubes in each group, the groups being spaced apart to provide a plurality of vertically elongated slots, means to deliver air rearwardly through the opening to the said slots and thence through the slots into the furnace, a rearwardly and laterally flaring deector directly in front of each group of tubes, an upright pipe located directly in front of each slot, and means to supply gas to the said pipes, each pipe having two vertical rows of openings in its rear surface arranged to discharge two rowsoic gas jets in rearwardly diverging directions' through the adjacent slot.

4. In combination with a furnace wall having an opening therethrough, a row of spaced upright water wall tubes adjacent the furnace side of the wall, certain of the tubes crossing the opening and being arranged to provide a plurality of vertically elongated slots between the tubes, a casing mounted inthe opening, one or more upright partitions within the casing and alterhating with the slots to divide the interior of the casing into a plurality of longitudinally extending passages leading rearwardly to the slots, means to supply air to the passages, an upright pipe located in each passage and directly in front of the corresponding slot, and means to supply gas to the said pipes, each pipe having openings therein for the discharge of gas into the air stream.

5. Incombination with a furnace wall having an opening therethrough, a row oi spaced upright water wall tubes adjacent the furnace side of the wall, certain ofthe tubes crossing the opening and being arranged to provide a plurality of vertically elongated slots between the tubes, a casing mounted in the opening, one or more upright partitions-within the casing to divide the interior thereof into a plurality of longitudinally extending passages leading rearwardly to the slots, means to supply air to the passages, separate means to control the supply of air to each passage, an upright pipe located directly in front of each slot,V means to supply gas to the pipes, and separate meansto control the supply of gas to each pipe, each pipe having openings therein for the discharge 'of gas into the air stream.

6. In combinationwith a furnace wall having an openingtherethrough, a row of spacedl upright water wall tubes adjacent the furnacel side of thewall, certain of the tubes crossing the opening and being arranged to provide a 'plurality of vertically elongated slots between the tubes, a casing vmounted in the opening, one or more up-` right partitions within the casing to divide the interiorY thereof Vinto a plurality of longitudinally extending passages leading rearwardly to the slots, .means to supply air to the passages,'sepa rate means to Acontrol the supply of air to each passage, an upright pipe located directlyin front of each slot, 'means to supplygas to the pipes, separate means to control the 'supply of gas to each pipe, each pipe having openings therein for the discharge of gas into the air stream, and means supporting each pipe for a forward sliding movementl to increase its distance from the water tubes.

7. In combination with a furnace wall having an opening therethrough, a row of spaced upright water wall tubes adjacent the furnace side of the wall, certain of the tubes crossing the opening and being arranged to provide a plurality of vertically elongated slots between the tubes, a casing mounted in the opening, one or more upright partitions within the casing to divide the interior thereof into a plurality of longitudinally extending passages leading rearwardly to the slots, means to supply air to the passages, separate means to control the supply of air to each passage, an upright pipe located directly in front of each slot and having openings therein for the discharge of gas into the air stream, a substantially horizontal gas supply pipe extending forwardly from each upright pipe, a separate gas control valve for each supply pipe, and means slidably supporting each supply pipe whereby it may be moved forwardly to increase the distance between the associated upright pipe and the water tubes.

8. In combination with a furnace wall having a rectangular opening therethrough, a row of spaced upright water wall tubes adjacent the furnace side of the wall, certain of the tubes crossing the opening and being arranged in groups with two closely spaced tubes in each group and wide spaces between the groups, a rectangular casing mounted in the opening, one or more upright partitions within the casing in substantial alignment with the tube groups to divide the interior of the casing into a plurality of longitudinally extending passages leading reai'-,

wardly to the spaces between the tube groups, means to supply air to the passages, separate means to control the supply of air to each passage, an upright pipe located in the rear portion of each passage and having openings therein for the discharge of gas jets into the air stream, a substantially horizontal gas supply pipe extending forwardly from each upright pipe, a separate gas control valvefor each supply pipe, and means slidably supporting each supply pipe .whereby it may be moved forwardly to increase the distance between the associated upright pipe and the water tubes.

9. In combination with a furnace wall having a rectangular opening therethrough, a row of spaced upright water wall tubes adjacent the furnace side of the wall, certain of the tubes crossing the opening and having reverse bends above and below the opening in the plane of the row to arrange the portions of the tubes adjacent the opening in groups with two closely spaced tubes in each group and wide spaces between the groups, a rectangular casing mounted in the opening, one or more upright partitions within the casing in substantial alignment with the tube groups to divide the interior of the casing into a 

